#视频文件读显#
import numpy as np
import cv2 as cv
cap=cv.VideoCapture('../../data/123.mp4')
while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        print("as")
        break
    gray=cv.cvtColor(frame,cv.COLOR_BGR2GRAY)
    cv.imshow('frame',gray)
    if cv.waitKey(1) == ord('q'):
        break
cap.release()
cv.destroyAllWindows()